Tol dosLla, a Human hailing from the planet Ukio, was a native son. As the eldest offspring of Gol dosLa, the Ukian Overliege, dosLla functioned as the primary voice for their government. Widely known as a skilled and respected politician, dosLla was the anticipated heir to his father's position. In the year 9 ABY, Imperial Grand Admiral Thrawn initiated a military campaign against the New Republic. Later in this campaign, Thrawn set his sights on Ukio, with the goal of seizing it and commandeering its food production and processing capabilities for his military forces. Following a brief engagement above the planet—during which Thrawn cleverly used cloaking technology to deceive the Ukians into thinking he possessed a superweapon that could penetrate a planetary shield—dosLla negotiated Ukio's surrender to Thrawn. Although outmatched in this conflict, dosLla successfully secured guarantees for the safety of the Ukian population and their homeland during the Imperial occupation.
A Human native of the planet Ukio, Tol dosLla called the Outer Rim Territories' Abrion sector home, on that agricultural world. DosLla was the oldest son of the Ukian Overliege, Gol dosLa, and by 9 ABY, he was the spokesman for him. As a capable politician, dosLla was thought to be the next Overliege.
Ukio became a target during Imperial Grand Admiral Thrawn's military campaign against the New Republic in 9 ABY. Thrawn aimed to secure Ukio's agricultural production and processing for his military forces, so he concocted a plan to make Ukio vulnerable. Thrawn spread New Republic forces thin by feinting attacks on other worlds. With the New Republic engaged elsewhere, Ukio was left exposed. Thrawn demanded Ukio's surrender as he led a task force into the system aboard his flagship, the Imperial II-class Star Destroyer Chimaera.
Initially, the Ukians didn't answer Thrawn's ultimatum, instead sending a distress signal to the New Republic base at Ord Pardron, which was responsible for their defense. However, Ord Pardron was unable to respond because of Thrawn's feints. The Ukians still felt safe, thanks to their planetary shield. Thrawn had anticipated this and had already arranged for cloaked cruisers to be towed beneath the shield by freighters disguised as civilian vessels. Thrawn used careful positioning and timing—along with the Force powers of the clone Dark Jedi Joruus C'baoth—to create the illusion that turbolaser fire from the Chimaera was penetrating the planetary shield and hitting targets on the surface. In reality, the Chimaera's fire was harmlessly dissipating on the shield, while the cloaked cruisers—aligned with the Chimaera's turbolaser fire—were firing devastating shots from within the atmosphere.
After two Ukian military air bases were destroyed, dosLla contacted Thrawn on behalf of the Overliege to request an end to the orbital bombardment and to discuss surrender terms. Thrawn, wanting the planet intact, ordered dosLla to recall all military forces, lower the planetary shield, and allow his forces to control the shield generators and all ground-to-space weapons. Thrawn promised that the Ukian people's societal and political structure would remain unchanged as long as they behaved. DosLla, suspicious, asked about forced conscription and war taxes. Thrawn, having cloning facilities on Wayland, didn't need conscripts and assured dosLla that Ukio's youth wouldn't be called upon. He also said that Ukio's contribution would be food from their agriculture industry, not war taxes.
DosLla knew that Thrawn's changes were the first steps in turning Ukio into an Imperial supply depot, but he had no choice but to comply, as refusal would mean the destruction of Ukio and its society. Defeated but defiant, dosLla told Thrawn that they were lowering the planetary shields as a sign of good faith, but he wanted guarantees for the safety of the Ukian people under Imperial rule before the shield generators and weapons were handed over. Thrawn, knowing that allowing the Ukians to surrender with dignity would delay resistance, told dosLla that a representative would be sent to discuss terms with the Overliege. DosLla, with no objections, ordered the shield lowered so Imperial forces could take up preliminary defensive positions.
Tol dosLla, a respected figure throughout Ukio, was known for being a skilled and effective politician. He was agreeable and soft-spoken, but unafraid to voice his opinions, using his gentle nature to persuade others to his viewpoint, a tactic he employed often. In 9 ABY, dosLla was chosen to represent the Overliege in negotiating Ukio's surrender to Grand Admiral Thrawn's Imperial forces. Despite facing overwhelming firepower and the belief that Thrawn had developed turbolasers capable of penetrating an intact planetary shield, dosLla negotiated assurances for the safety of the Ukian people and their land.
DosLla always carried a datapad with harvest production schedules.
Tol dosLla made his debut in The Last Command, the final book of the Thrawn Trilogy by Timothy Zahn. He then appeared in the first issue of the comic book adaptation of The Last Command (The Last Command). DosLla also had a short entry in The Last Command Sourcebook by West End Games, reprinted in The Thrawn Trilogy Sourcebook.
Although The Last Command Sourcebook described Ukians as hairless, green-skinned, and red-eyed, dosLla was depicted as a light-skinned Human with brown hair and a beard in The Last Command 1. Since Humans like Rebel scout Janse and Imperial scout trooper Oberk were born on Ukio, this article assumes dosLla is a Human of Ukian nationality.
DosLla's name has been misspelled in various sources. His first appearance in The Last Command and The Last Command 1 spelled his name as "Tol dosLla," but The Last Command Sourcebook spelled it as "dosLa," without the second "l." This spelling also applied to his father, Gol dosLa. The Complete Star Wars Encyclopedia, published in 2009, used the double "l" spelling, effectively canonizing that name as the correct spelling. Since his father wasn't mentioned in the Encyclopedia, his father still uses the dosLa surname.